Numerical Analysis of a Rotor-Bearing System Supported by Elastomeric Dampers

  • Cleber Caetano Thomazi
  • Marcelo Braga dos Santos
  • Francisco Paulo Lépore Neto

Resumo

AbstractIn the present work, the dynamic behavior of a flexible rotor supported by fluid film journal bearings with additional damping provided by elastomers is studied. The damping devices are introduced between the bearings and their housings. The finite element method is used to model the system. The viscoelasticity is implemented through the use of Prony series. The influence of the viscoelastic properties and the dimensions of the elastomeric damper on the synchronous response are discussed. It is verified that the viscoelastic dampers may be good alternatives in the mitigation of dynamic problems inherent of high-speed and light-weight rotating machinery.Keywords: rotordynamics, fluid film bearings, viscoelastic dampers.ResumoNeste trabalho é apresentado o estudo do comportamento dinâmico de um rotor flexível suportado por mancais de filme fluido com amortecimento adicional fornecido por elastômeros. Os dispositivos de amortecimento são introduzidos entre os mancais e seus alojamentos. O método de elementos finitos é usado para modelar o sistema. A viscoelasticidade é implementada através de série de Prony. Discute-se a influência das propriedades viscoelásticas e das dimensões do amortecedor elastomérico sobre a resposta ao desbalanceamento. Verifica-se que os amortecedores viscoelásticos podem ser boas alternativas na mitigação de problemas dinâmicos inerentes às máquinas rotativas supercríticas.Palavras-chave: dinâmica de rotores, mancais de filme fluido, amortecedores viscoelásticos.

Referências

REFERENCES
[1] Vance, J.M., Rotordynamics of Turbomachinery1988: John Wiley & Sons.
[2] Genta, G., Dynamic of Rotating Systems2005: Springer.
[3] Powell, J.W. and M.C. Tempest, A Study of High Speed Machines With Rubber Stabilized Air Bearings. Journal of Lubrication Technology, 1968. 90(4): p. 701-707.
[4] Darlow, M. and E. Zorzi, Mechanical Design Handbook for Elastomers1981: MTI / NASA, New York.
[5] Dutt, J.K. and B.C. Nakra, Vibration Response reduction of a rotor shaft system using viscoelastic polimeric supports. Journal of Vibration and Acoustics, 1992. 153: p. 221-223.
[6] Dutt, J.K. and B.C. Nakra, Vibration response reduction of a rotor shaft system using viscoelastic polimeric supports. Journal of Vibration and Acoustics, 1993. 153: p. 12.
[7] Shabaneh, N.H. and J.W. Zu, Dynamic Analysis of rotor-shaft systems with viscoelastic supported bearings. Mechanism and Machinery Theory, 2000. 3: p. 1313-1330.
[8] Bormann, A., Elastomerringe zur Schwingungsberuhigung in der Rotordynamik - Theorie, Messungen und optimierte Auslegung., in Fakultät V - Verkehrs- und Maschinensysteme der Technischen Universität Berlin2005, Technischen Universität Berlin. p. 150.
[9] Cha, M., E. Kuznetsov, and S. Glavatskih, A comparative linear and nonlinear dynamic analysis of compliant cylindrical journal bearings. Mechanism and Machine Theory, 2013. 64(0): p. 80-92.
[10] Thomazi, C.C., F.d.P. Lépore, and M.B.d. Santos, Unbalance Response of a Flexible Rotor Supported by Fluid FIlm Bearings with Additional Viscoleastic Damping, in XIV Diname, ABCM, Editor 2011. p. 10.
[11] Thomazi, C.C., M.B.d. Santos, and F.P. Lépore. Analysis of a rotor-bearing system with elastomeric dampers. in VII Congresso Nacional de Engenharia Mecânica CONEN 2012. 2012. São Luís.
[12] Lépore Neto, F.P. and M.B.d. Santos, A Procedure for the Parametric Identification of Viscoelastic Dampers Accounting for Preload. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2011. 33: p. 308-313.
Publicado
2017-03-20